/**
 * Copyright (C) 2010 Alfredo Morresi
 * 
 * This file is part of RainbowLibs project.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package it.rainbowbreeze.libs.common;

import android.text.TextUtils;

public class RainbowContractHelper {
	//---------- Constructors

	//---------- Private fields

	//---------- Public properties

	//---------- Public methods
	/**
	 * Ensures that an object reference passed as a parameter to the calling
	 * method is not null.
	 *
	 * @param reference an object reference
	 * @return the non-null reference that was validated
	 * @throws NullPointerException if {@code reference} is null
	 */
	public static <T> T checkNotNull(T reference) {
		if (reference == null) {
			throw new NullPointerException();
		}
		return reference;
	}

	/**
	 * Ensures that an object reference passed as a parameter to the calling
	 * method is not null.
	 *
	 * @param reference an object reference
	 * @param errorMessage the exception message to use if the check fails; will
	 *     be converted to a string using {@link String#valueOf(Object)}
	 * @return the non-null reference that was validated
	 * @throws NullPointerException if {@code reference} is null
	 */
	public static <T> T checkNotNull(T reference, Object errorMessage) {
		if (reference == null) {
			throw new NullPointerException(String.valueOf(errorMessage));
		}
		return reference;
	}

	/**
	 * Ensures that the string is nor null not empty.
	 * 
	 * @param reference
	 * @param errorMessage
	 * @return
	 */
	public static String checkNotNullOrEmpty(String reference, Object errorMessage) {
		if (TextUtils.isEmpty(reference)) {
			throw new NullPointerException(String.valueOf(errorMessage));
		}
		return reference;
	}
	  
	  
	  
	  
	//---------- Private methods

}
